Andrew thomson



gNo Model.)

A. THOMSON. SPARK AREE-STER.

Eatented Apr. 15, 1890.

WVM/momo:

' UNITED STATES PATENT OEEICE.

ANDREr THOMSON,l OF BATTLE CREEK, MICHIGAN, ASSIGN OR TO THE d NICHOLSd: SHEPARD COMPANY, OF SAME PLACE. i

SPARK-fARRESTER.

SIPEGI `IG1JION forming part of Letters Patent No. 425,555, dated Aprill5, 1890. Application filed January 3l, 1890. Serial No. 338,738. (Nomodel.)

To @ZZ whom it may concern.-

Be it known that I, ANDREW THOMSON, a citizen of the United States, anda resident of Battle Creek, county of Calhoun, and State of Michigan,have invented a new and useful Improvement in S park-Arresters, of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings, making part of this specification.

My invention relates to the means-for supporting the conical screen inthe smoke-stack and for facilitating its removal therefrom for cleaning,relieving, or freeing the dra-ft from obstruction when required, te.,and will be readily understood from the following description andclaims, reference being had to the accompanying drawings, in which-Figurel represents a vertical sectionthrough the upper part of asmoke-stack, the bonnet thereon, and the ring supporting the wirescreen, the screen being shown in elevation. Fig. 2 shows a sectionthrough the ring detached, and Fig. 3 is a plan or top view of thebonnet and ring.

A indicates the smoke-stack, and B a bonnet-extension thereof secured tothe upper end thereof. This bonnet at its lower end where it joins theupper end of the stack is made of an internal diameter to fit snugly onthe end of the stack, to which it is riveted.

Immediately above the end of the stack the side walls of the bonnet aremade rapidly flaring to a point indicated at b, from which point theyconverge again in arching form to a point b nearly over the lower end ofthe bonnet, where they terminate in an upright annular flange or ringb2. This flan ge is made flaring outward on its inner face andterminates at its lower end on said face in an inwardly-projectingannular rib or ledge b3, forming a support for the ganze-holder ring C.The ring C is made flaring at its upper end on both its inner and outerfaces to facilitate its insertion into and to Asnugly fit wedge like theflaring end of the bonnetring b2, terminating in a shoulder or rabbet atc, to rest on the ledge b3. The flaring inner face at the upper end ofthe ring C conforms to the converging .sides of the upper end of the innverted cone-shaped screen D, which is com posed of wire-gauze and servesto arrest the sparks and cinders in a manner well understood. The upperend of the screen lits the upper flaring end of the ring snugly, and isretained in place thereby without the aid of fastenings; butit may befastened,if desired, in any suitable manner. The ring C from theshoulder c downward is cylindrical in form, the sides of the cone-screendiverging inward therefrom, as shown, leaving the pendent portion c ofthe ring standing removed from the cone and between it and the archingportion of the bonnet, as shown. By this arrangement the sparks andci'nders, following the flaring walls of the bonnet and being deflectedinward again by the arching upper portion thereof, as indicated by thearrows in Fig. l, are thrown against the pendent portion c of the solidring C instead of against the weaker sides of the screen, and dropthence downward into the smoke-box, from which they may be removed inany usual manner.

The ring C is provided with a bail or handle C in the form of a rodextending diametrically across it from side to side and secured in anysuitable manner, and Vby means of of which the ring and cone-screen canbe readily lifted out of the bonnet for cleaning the screen or freeingthe draft of the furnace from the obstruction caused thereby wheneversuch removal is desirable, as in kindling there or when a fuel is usedthat does not require the use of the sparlnarresting screen.

I am aware that screen-supporting rings have been employed provided witha hookflange for engaging the bonnet-ring or annular flange. This I donot claim; but,

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, isd

l. The combination, with the smoke-stack, of a bonnet having the flaringand arching side walls, as described, and terminating at its upper endin an annular flange vor ring made flaring and provided with an annularledge or rib on its inner face, and the flaring and shoulderedscreen-holder ring fitting said bonnet-ring, substantially as described.

2. The combination, with the smokestack IOO bonnet-ring,V of thescreen-holder ring made daring on lits outer facel to engage thebonnetring, and also on its inner face, as described, and thecone-shapedscreen secured to said Haring inner face of the holder-ring,substantially as described. i

3. The eombination,`with the smoke-stack bonnet, of the`screen-ho1der:ring having` a flaring inner face and the invertedconeshaped screen suspended therefrom, said ring having its lowerpendent end suspended between the screen and bonnet and removedtherefrom, substantially as described.

4. The combination, with the 'aring'fsmoke'

